NTA907HD and NTA3007HD
Operating Instructions
Great Plains
| 166-207M | 02/26/2019
43
Service Brake Operation
If optional brakes are installed and connected, the
hydraulic/hydraulic or air/hydraulic systems automatically
work in conjunction with the tractor’s own brakes.
Application and release of tractor brakes during tractor
motion applies and releases the service brake system on
the drill.
Know Your Tractor Systems:
Application of tractor Parking and/or Emergency brakes may
or may not
operate the drill service brake system, depending
on the design of the tractor systems.
Consult your tractor manual for details on when remote
brake ports are engaged and released. Note any
variance from general behavior in the table at right. Make
sure the tractor operator knows when drill brakes are
engaged and released.
Single-Line Hydraulic Brake Operation
In this system, a single hydraulic line
from the tractor
operates a de-intensifier
cylinder on the drill, which is
coupled to the drill master cylinder
. The drill brake
hydraulic lines are separate from the tractor’s line.
With the hydraulic/hydraulic system, braking is
immediately available when the tractor hydraulic system
is active.
Dual-Line Air/Hydraulic Brake Operation
In this system, the “supply” (yellow or blue coded) line
charges a reservoir air tank
on the drill. The “service”
(red coded) line
meters air from the reservoir
to a
booster cylinder
, which operates the drill’s hydraulic
brake lines
.
Service Air Brakes Not Instantly Available:
Prior to movement, wait for the tractor air system to reach full
charge after drill hookup. Tractor and drill reservoir tanks
must be pressurized. Drill service braking may not be
immediately available upon tractor hookup with the air/
hydraulic system.
Tractor Braking-
Related Event
Typical Trailer
Brake Port
Response
Record How
Your Tractor
Operates
Normal tractor
braking
Activates trailer
brakes
Differential
tractor braking
Reduced trailer
braking
Tractor Parking
Brake
Activates trailer
brakes
Tractor
Emergency
Brake
Tractor
transmission to
Park
No effect on trailer
brakes
Figure 42
Hydraulic/Hydraulic Brakes
29588
1
2
3
Figure 43
Air/Hydraulic Brakes
29578
4
6
5
7
8
Summary of Contents for NTA3007HD
Page 2: ...Great Plains 166 207M 02 26 2019 Table of Contents Index ii 166 207M Table of Contents Index ...
Page 4: ...2SF24 and 2SF30 ...
Page 177: ...Table of Contents Index Table of Contents Index ...
Page 178: ...Great Plains Mfg 1525 E North St P O Box 5060 Salina KS 67402 Table of Contents Index ...